Gas meter



Aug. 14, 11923.y '1,464,972

J. W. DANAHER GAS METER Filed Jun@ 29 1922 1- ESL- lllllmmlllllll Hllllllllllllh www f--f ""'lrmll'n Ilrewmw i lN-VENTDF.

VPatented'Amiga'14, 1923.,V i "''l i aaneen iyrnrnnfeorarenrtrataran, orroaoNfraoaNADm DANAHR,

YOffthe- A'city.ot"Torontofin the 4county of YorlQPifovince of Ontaria, Canada, ya subjectof the King of Great Britain', have i n- .vented certain new. aiidiiseful Improve.-

nieiits in G as ,Meters, ;.of which Y the follovvf y 'This inventionr'lates to devieeszfor pre- ,venting the; reversal.; of the direction` of operation of .themeter mechanism. bythe i expedi- Y V'ent o`f`re'versingfthe inlet outlet'connec- V`tions of. the meter. and known; as back checks tangent arm-@Which :actuates `vthe vrecording Vmechanism:of the meter. vshould be, permitted. to makefat 'least onercomplete circuit of .its .path in a reverse.,directionv beforefbeing stopped by 'thefcheokfasotherwisethere is Vdanger of themeter mechanism ybeing damaged by anyba'ckpressure which niayoccur .after gas flow ,from the` meter is shut off.

lt is also desirable thatfthe aotionof the check, when the meter is functioning Anor-V mally, should '-bej' asA quiet-'as possible,A as under some conditions, the noise isobjeetionable. A back check must also besiinple and absolutely reliable, andthe objeotofmy'i-nvention is toprovide a back checkvvliich -Will Ys atisiactorily fulfill all the., required conditioiis.V Y 1 A I attain my object by utiliziiigia Worm Y Vwhich is Vsecured to the Spindle of `the tangent arm andl vvhich is adapted to engage and actuate one arm of'abell ora-nk lever, the

other end'ot which normally lies out of theV path of the tangent armjairid is passed .by the tangent when the latter is travelling in the normal direction. A reversal of the direction of motionof the tangent arm causes the Worm Vto engage the lever androclr it to Vdraiv'itslfree 'end into the path @of fthe tangent arm but, the Worm being of plete revolution. y

. small pitch, this does ,not take place until thi.` tangent-arm has made atleast one com- The invention is hereinafter more fully describedand isillustratedin the accomanvin drawin s in which.- u' C Fig. lis a plan view showing part of l Vthe. mechanism ofa meter provided with my improved back check;

QfReferring`particularlyte .1 andi -i Gaelle-Erna; i.

Fig@t a similar vieiv showing the back cheek inoperative position@ a In the draivingslike numerals of reference V vindicate corresponding parts in' the different l are the flag Wires of an ordinary gasineter,

nected by. links 3 fwith a tangent arm 4,

Vwhich is connected to the verticall spindle-5.

These parts are oldzin the art, and` it vvill be understood Athat by the rocking of the arms 2 that the tangent arm is moved ina circular orbit to .rotatethe spindle 5. A This s pindlecarries a Worm 6,- `which meshes With a Worin Wheel 7 on .ai horizontal spindle 8,

ivhichris adapted to operate therecording `mechanism, not shown.,

Adjacentthelyvormff is ysecured on the meter casing a-,bracket 9, and ori-this bracket QI' fulcrum a bell cranlrlever 10. One end ol this.bellcranlnlevcr` is adapted to engage .the Worin;` 6`, iv`hile.` the other Tend is adapted; when; the lever `is rocked, to move Y'into or outpofftheA path 'of the end of the tangent arm- 4,. The `ivorin is preferably formed with a' V-thread. and fthe 'end'o't the bell cranklever, which it engages, is pref- ;oHiiT-W. nnNAHEig-or'roa'onfjo,"on'raarooeitana;assienonmo 'rn-E STANDARD lM- Y Y Y 4 f rig. t a side View ofthe same parts with g the back check in inoperative position; andY -toivhich are connectedV therockarms 2 conerably forked to engage over the thread,

as shown. The result of this arrangement is that when the Worm is rotated in its normal direction, as indicated by the arrow in Fig. 3, theV adjacent end of the bell crank lever rides on top of the thread of the Worin, dropping slightly as the extreme end of the thread passes underneath it, but, owing to the small pitch of the thread, this drop is not sulicientlto raise the outer end of the bell cranlelever into the path of the tangent arm. This drop is made very small, and

therefore practically noiseless by the expedient of making the eXtreme end of the -thread of the worm approach somewhat the yunderlying"portion of the thread, as seen.

particularly in Fig. 4, so that there is a very narrow space between the eXreme end and the underlying part of the thread. The

I lower part 120i the 4forked end of the bell yexs arm, as shown in Fig. 5.

directionoi rotation of the Wormvis reversed.

The--fulcrum'l of the bell crank lever is,

of course, so positioned that the bell crank'- leverztends to rock by gravity to its check-VV A ing position. A Y

A pin 14 islpreferably provided secured to the bracket 9Vand extending above the inner.

part of the bell crank lever so as to prevent the inner end being thrown up tofo far from any cause. As long as the meter is operating normally and the Worm 6 rotating in the normal direction, the bell crank lever occu-V pies substantially the position shown in Fig. 4, merely rocking slightly as the end oit' the Worm passes underneath it.r:l^f,v however, the direction of operation ofthe meter be reversed, the direction of rotation oi the Worm is reversed and the end of the bell cranklever is engaged, the worm actuating the bell crank lever to throw its upper end into the path of the outer end oi' the tangent The'il'iitch of the Worm is such thz'itthisA 'does not take place before the tangent arm has made one complete revolution.

lIt vvillbe noted that thebracket 9 has a part extended' up behind the outer end of the bell crank lever to support the latter,V

4and thusV relieve the strain on the iLilCrmn, When .the lbell cranklever is engaged by the tangent arm and operates as a back check.

tionof the spindle. '1

crumed so that one end maybe brought into or out of the path of thetangent arm; and a ivorm secured 'to the spindle adapted to engage and actuate the'lever to bringvthe latter lto or from a tangent arm engaging position according to the direction of rota- 2. A gas meter constructed as set Vforth in claim 1 in Which the lever'is of the bell crank'type and positioned so that its outer end moves in a. direction tovvards'and away from the spindle, the other end of the lever riding on the end of the Worm `When the spindle is rotating in its Vnormal direc-tion.V

3.` ln a meter provided with a suitably actuated tangent arm and a spindle connected to and rotated by *said tangent arm; the combinationV therewith of a lever suitably fulcrumed so that one/end may be brought into or out ofthe path4 of thetangent arm' and a VWorm secured to the spindleatlapted to engageV and actua-tefthe lever tofbring the latter to or trema tangent arm engagingV position according to the direction of rotation of thespindleyan'd a stop limiting the movement of the lever away from the path of the tangent arm. f p Y 4. ln a meter provided with a suitably actuated tang-ent arm and a spindfe connected to and rotated by said tangent arm; the combination therewith of a lever su itably ulcrumed so thatone end maybe brought into or out ofthe path of the tangent arm, the other end of the lever being forked; and a worm Asecured to the spindle adapted to engage the forked end of the lever to actu-ate the latter toi or from a tangent arm engaging position according to the direction of rotationof the spindle. Y

Signed at Toronto7 Canada, this 16th 'day of June, 1922. Y Y

JOHN vv. DANAHER. 

